在XML模式的complexType中使用？

<xs:complexType name="loss">
    <xs:all>
        <xs:element name="lossCause" type="xs:string"/>
        <xs:element name="lossDate" type="xs:dateTime"/>
        <xs:element name="lossDescription" type="xs:string"/>
        <xs:element name="lossLocation" type="address" minOccurs="0"/>
        <xs:element name="lossTime" type="xs:string" minOccurs="0"/>
        <xs:element name="officials" minOccurs="0">
            <xs:complexType>
                <xs:sequence>
                    <xs:element name="official" type="official" minOccurs="0" maxOccurs="unbounded"/>
                </xs:sequence>
            </xs:complexType>
        </xs:element>
    </xs:all>
    <xs:attribute name="incidentOnly" type="xs:boolean" use="required"/>
    <xs:attribute name="lawsuit" type="xs:boolean" use="required"/>
</xs:complexType>

和：

<xs:complexType name="propLoss">
    <xs:complexContent>
        <xs:extension base="loss">
            <xs:all>
                <xs:element name="damageDescription" type="xs:string"/>
                <xs:element name="property" type="property"/>
                <xs:element name="responsibleParty" type="contact" minOccurs="0"/>
            </xs:all>
            <xs:attribute name="businessOperational" type="xs:boolean" use="required"/>
            <xs:attribute name="propertyLivable" type="xs:boolean" use="required"/>
            <xs:attribute name="weatherRelated" type="xs:boolean" use="required"/>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

但是,在验证时,我收到一条错误,指出在复杂损失类型及其扩展名propLoss定义中不允许使用所有模型组.我做错了什么？

谢谢！

Note: This specification allows only appending, and not other kinds of
extensions. This decision simplifies application processing required
to cast instances from derived to base type. Future versions may allow
more kinds of extension, requiring more complex transformations to
effect casting.

不确定丢失的问题是什么,除非它因propLoss错误而造成附带损害.